Insulating coupling device.



No. 048,|74. Patented Apr. 24, |900. 0. w. MEYRowlTz.

INSULATING CUPLING DEVICE.

(Application med Feb. 27, 1900.)

(N0 Model.)

z @035609: 15in/@Milf UNrTnD STATES PATENTl OFFICE.

OSCAR IV. IWIEYROVITZ, OF NEW ROCHELLE, NEW YORK.

INSULATING COUPLING DEVICE.

SPECIFICATION forming part of Letters Patent No. 648,174, dated April24, 1900.

Application iiled February 27, 1900. Serial No. 6,773. (No model.)

To all whom, t ncty concern:

Be it known that I, OSCAR WILFRIED MEY- ROWITZ, a citizen of the UnitedStates, and a resident of New Rochelle, in the county of Westchester andState of New York, have invented certain new and useful Improvements inInsulating Coupling Devices, of which the following is a specification.

My invention relates to a coupling device designed more particularly fordentists and surgeons use in connection with an electric motor, theconstruction of the coupling being such as to entirely insulate theelectric current from the flexible shaft used for rotating 4the dentalinstrument, thus obviating all danger of electric shock to the patient.

In the accompanying drawings, to which reference is made and which forma part of this specilication, Figure 1 is a side elevation of my newcoupling-socket, and Fig. 2 is longitudinal sectional elevation of thesame.

In the drawings, 2 represents a metal shell or casing formed at one endwith a head 3, reduced and extended to form a boss 4, the end of whichis externally screw-threaded, as shown at 5. The head 3 and boss I arecentrally bored, as shown at 6, to form a bearing. The opposite end ofthe shell or casing 2 is provided with an annular plug 7, of insulatingmaterial, such as hard india-rubber, vulcanized fiber, or other suitablematerial. This plug forms another bearing S in line with the bearing 6.

9 is a cylinder, of hard india-rubber, vulcanized liber, or otherinsulated material, provided at one end with a reduced central shaft 10to fit the bearing 6 and provided at the other end with another reducedcentral shaft 12, which fits the bearing S. The body of the cylinder 9is provided at or near its ends with metal bearing-rings 13 13, which tthe interior of the shell or casing2, so that the said metal shell orcasing and the said metal rings form metal bearings for the rotation ofthe cylinder 9.

The shaft 10 is provided centrally at its outer end with a projectingmetal socket 1a for attaching with any appropriate flexible connectionto be rotated for rotating the dental or surgical instrument to be used.The shaft l2 is provided centrally with a metal rod or arm 15,preferably squared at one side, to connect with the shaft of an electricmotor, so that the rotation of the motor will, through the rod or arm15, rotate the cylinder 9 and the shafts 10 and 12.

Having thus described my invention, what I claim as new, anddesire tosecure by Letters Patent, is-

1. The coupling-socket herein shown and described the same consisting ofa metal casing or shell having a reduced bearing at one en d and anannular reducedbearin g of insulating material at the opposite end, incombination with a cylinder of insulating material formed with bearingsof the same material at each end, and provided with metal bearingringsto run in the said metal casing or shell substantially as described. p,

2. The cylinder 9 of insulating material formed with reduced bearings10, 12, each having a metal connection embedded in it and provided withmetal bearing-rings 13, in combination with a metal shell or casing inwhich the said cylinder is held and rotated substantially as described.

OSCAR YV. MEYROVVITZ.

Witnesses:

JEAN Soni/npr, e I-I. A. WEST.

